Micropower Buck/Boost Circuits

Posted on Apr 10, 2012

Two combinations of cell count and output voltage are to be strictly avoided: three cells converted to 3.3V and four cells converted to 5V. These combinations are troublesome because no ordinary regulator (boost, buck or linear) can accommodate a situation where the input voltage range overlaps the desired output voltage.

This design note presents four circuits capable of solving the 3-cell dilemma. Design Note 110 will discuss 4-cell, 5V circuits. The LT®1303 and LT1372 high efficiency DC/DC converters are used throughout, giving a fair comparison of each topology

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